/Engine/Source/Editor/SequencerCore/Public/MVVM/ViewModels/OutlinerSpacer.h
virtual void PerformDrop ( const [FViewModelPtr](API\Editor\SequencerCore\FViewModelPtr) & TargetModel, const [FDragDropEvent](API\Runtime\SlateCore\Input\FDragDropEvent) & DragDropEvent, EItemDropZone InItemDropZone )